How many presses of about 1 second can a car horn make if connected to a 12V, 7.5Ah alkaline lantern battery?
Tuesday, April 27th, 2010 at
1:43 am
I want to add a car horn to a bicycle and power it with a 12V, 7.5Ah alkaline lantern battery.
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The actual answer will probably have to be determined experimentally, since we don’t know how the battery’s current delivery will diminish as it discharges, or what the internal resistance of the battery is, but assuming that the car horn draws about 5 amperes of current at 12V, the 7.5 Amp-hour rating means that it could ideally run the horn for about an hour and a half. That’s about 5,400 one-second presses.
The big question is whether the battery is designed to handle a 5-amp load. That 7.5 A-h rating may be assuming a much smaller current draw.